Alkoxymethylenamides of omicron, omicron-dialkylthio-or omicron, omicron-dialkyl-dithiophosphorylacetic acids



The present invention relates to a new class of phosphoric acid derivatives comprised in the general Formula 1 in which R and R" are alkyl radicals having a low molecular weight, R being different or equal to R", X is oxygen or sulfur, R is an alkyl radical having a linear or branched saturatedor unsaturatedchain. The R; radical may contain a halogen, an oxyalkyl or a thioalkyl group.

The present invention also relates to processes for prepa-' ration of the above-mentioned phosphoric acid derivatives and their application as pesticides.

One object of the present invention is the provision of a new class of phosphoric acid esters of the general Formula 1, as above. These .phosphoric acid derivatives are in the form of oils or crystalline low melting products, soluble in most of the organic solvents. The compounds in which X is sulfur, are scarcely water-soluble, while those in which X is oxygen are generally very soluble in water.

A further object of the present invention is a process for preparing compounds comprised in the general Formula I. Said process is characterized by the fact that ametal dialkylthio or. dialkyldithiophosphoric salt of the type:

P-SMe (wherein R, R" and X are the aforesaid groups and Me is sodium or potassium) is reacted, in the presence of water or of an inert solvent (e'.g. acetone) at a temperature between 15 and'SO? C., with an alkoxymethylenamide of monochloroacetic acid of the type:

(wherein R has the above-mentioned meaning) until all the metal halide is precipitated according to the equation:

After removing the inorganic salt formed by filtration,

the above reaction product is removed by adding to water or by evaporating the solvent under reduced pressure.

Another process for preparing compounds of the general Formula 1, wherein R, R" and R have the above-mentioned meaning and X is sulfur, is carried out by reacting United States Patent ice an N-methylolamide of an 0,0-dilalkyldithiopl1osphorylacetic acid with an alcohol, according to the equation:

The above reaction is carried out in the presence of an acid, e.g. HCl, which acts as condensing agent. An excess of R OH or a solvent or a mixture of inert solvents can be used as a diluent. The reaction temperature is kept 20 and C. The reaction product is separated in a conventional manner, for instance by adding water (when the solvent used is water miscible) and/ or preferably, by evaporating the solvent or the solvent mixtures, after having removed the acid catalyst.

Another object of the present invention is the provision of parasiticidal compositions containing one or more compounds comprised in the general Formula 1 either as single active component or mixed with other known substances having a parasiticidal activity and/or mixed with the adjuvants commonly used in the parasiticidal formulations.

All the compounds of the general Formula 1 have a remarkable parasiticidal activity either against domestic insects (e.g., Musca domestica) or against insects which are of interest to agriculture (e.g., aphids and red spider).

Further said compounds are adsorbed by the plant and transferred to all its organs. This property can therefore be exploited to control a large number of species of plant parasites.

The compounds of the instant invention can be used in various ways. Generally, it is advisable to dilute said compounds with solid or liquid carriers by adding wetting agents, or adhesives or dispersion agents oremulsifiers. Other substances having parasiticidal and/or fungicidal activity can be also associated with the above-mentioned compounds.

Among the compounds comprised in the general Formula 1 those in which R and R" are preferably a methyl or ethyl group, and R is a methyl, ethyl, propyl, isopropyl, propargyl, allyl, chloroethyl, methoxyalkyl or mercaptoalkyl radical show a particularly high parasiticidal activity. Among the above-mentioned compounds the following proved to be particularly active:

Methoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

Methoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid,

Ethoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

Propoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

Propoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid, 1

Isopropoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

Isopropoxymethylenamide of 0,0-diethylthiophosphorylacetic acid,

Isopropoxymethylenamide of 0,0-diethyldithiophosphorylacctic acid,

Propargyloxymethyenamide of 0,0-dimethyldithiophosphorylacetic acid,

Propargyloxymethylenamide of 0,0-diethyldithiophosphorylacetic acid,

Allyloxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

3 Allyloxymethylenamide of 0,0-diethyldithiophosphorylacetic acid,

Bcta-methoxyethoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

Beta-methoxyethoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid,

Methylmercaptoethoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid,

Beta-chloroethoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid,

Methoxymethylenamide of phosphorylacetic acid,

Ethoxymethylenamide of the O-methyl, O-ethyl-dithiophosphorylacetic acid,

Isopropoxymethylenamide of the O-methyl-O-ethyl-dithiophosphorylacetic acid,

N-propoxymethylenamide of the O-methyl, O-ethyl-dithiophosphorylacetic acid,

Propargyloxymethyleneamide of the O-methyl, O-ethyl-dithiophosphorylacetic acid,

Allyloxymethylenamide of the O-methyl, O-ethyl-dithiophosphorylacetic acid,

Beta-methoxymethylenamide of the O-methyl, o-ethyldithiophosphorylacetic acid,

Beta-methyl-mercaptoetoxymethylenamide of the methyl, O-ethyl-dithiophosphorylacetic acid, As illustratory of parasiticidal formualtions using the new class of phosphoric acid derivatives are the following:

the O-methyl, O-ethyl-dithio- Parts by weight Methoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid 2O Methylcellosolve 70 Surfactants consisting of the condensation product of ethylene oxide with alcohols and fatty acids Isopropoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid Xylene 70 Surfactants consisting of the condensation product of ethylene oxide and fatty alcohols and alkylphenols 10 Methoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid 10 Isopropoxymethylenamide of 0,0 diethylthiophosphorylacetic acid 1O Methanol 70 Surfactants consisting of the condensation product of ethylene oxide with fatty alcohols and al-lkylphenols 10 Methoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid 5 Dichloro diphenyl trichloroethane Diatomaceous earth 53 Alkylarylsulphonates 7 The following examples are given to illustrate the invention, but they are not limitative.

Example I dimethylclithiophosphorylacetic acid having the structural formula:

I cmo S 01120 011:

are obtained:

Example 2 crystalline product are obtained, having a melting point 40-42 C., and being structurally identical to the product obtained according to the procedure described in Example 1.

Analysis.N percent found: 5.35-5.38. N percent calculated: 5.40.

Example 3 31.2 g, of potassium salt of 0,0-diethylphosphoric acid are added to 20.5 g. of methoxyrnethylenamide of the monochloroacetic acid dissolved in 60 m1. acetone. The mixture is heated under stirring at 40 C. for 10 minutes and is then maintained at room temperature for 20 hours. The potassium chloride (11 g.) obtained is separated by filtration and the obtained filtrate is concentrated under reduced pressure until the solvent is completely removed. The residue oil consists substantially of methoxymethylenamide of 0,0-diethylthiophosphorylacetic acid of the formula:

AnaIysis.-N percent found: 4.76. N percent calculated: 5.16.

Example 4 24.8 g. potassium salt of 0,0-diethylthiophosphoric acid are treated with 31.3 g. isopropoxymethylenamide of the monochloroacetic acid in 60 ml. acetone. The mixture is heated for half an hour and then maintained at room temperature for 15 hours. Separating the products of the reaction in the manner described in Example 3, 44 g. product are obtained, which consists substantially of isopropoxymethylenamide of 0,0-diethylthiophosphorylacetic acid of the formula:

Analysis.N percent found: 4.24. N percent calculated: 4.68.

Example 5 30 g. methylolamide of 0,0-diethyldithiophosphorylacetic acid are treated with 40 ml. ethanol and 2 ml. 10% HCl methanol solution. The mixture is heated at 45 C. for 6 hours in a sealed vessel. The mixture is kept for 48 hours at room temperature and is then treated with ml. H O. An oily liquid is separated which is diluterl with methylenchloride and washed with H O. After havlng completely removed the solvent, 24 g. methoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid of the formula:

are obtained.

5 /lnalysi.r.-P percent found: 10.57. P percent calculated: 10.79.

Example 6 40 g. methylolamide of 0,0-dimethyldithiophosphorylacetic acid are treated with 50 ml. anhydrous ethyl alcohol and 30 ml. of a 10% HCl ethanol solution. Separating the products of the reaction in the same manner as described in Example 5, about 40 g. ethoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid of the formula:

01-140 8 CH;O 01H5 added and subsequently the reaction mass is twice washed with 100 ml. H and finally the solvent is removed under reduced pressure. 40 g. colorless oil are thus obtained, which consists substantiallyof isopropoxymethylenamide of 0,0-diethyldithiophosphorylacetic acid of the formula:

PSCHQ-C ON/ on, cane g CHI-04E Analysis.N percent found: 4.36. N percent calculated! 4.44.

Example 8 37 g. methylolamide of 0,0-dimethyldithiophosphorylacetic acid are treated with 40 ml. ethylacetate, 9 g. isopropyl alcohol, 4 ml. of a HCl isopropanol solution.

Separating the products of the reaction in the manner described in Example 7, 37 g. of a colorless oil are obtained; said oil consists substantially of isopropoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid of the formula:

CHaO H I P*S CHT CON/ CH3 onto s ou -04E];

Analysts-N percent foundi 4.71. N percent calculated: 4.87. 5 3

Example 9 31 g. methylolamide of 0,0-dimethyldithiophosphorylacetic acid are treated as described in Example 7, with 30 ml. ethylacetate, 7.5 g. n-propyl alcohol,'3 ml. of a 10% HCl propanol solution. The reaction mixture yields 31.5 g. of an oil consisting substantially of propoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid of the Analysis-.N percent found: 4.80. N percent calculated: 4.87.

Example 10 41 g. methylolamide of 0,0-diethyldithiophosphoracetic acid are treated according to the procedure described in Example 7 with 50 ml. ethyl acetate, 9 g. npropyl alcohol and 5 ml. at a 10% lICl propane! solution. 41.5 g. oil. consisting substantially of propoxy methylenamide of 0,0-dicthyIdithiophosphoryl acetic acid of the formula:

/I""SCII2CONHCllrOCIIr-CH2CII3 051150 S are obtained.

Analysis.-N percent found: 4.40. N percent calculated: 4.44.

Example 11 37 g. methylolamide of 0,0-dimethyldithiophosphorylacetic acid are treated, according to the procedure described in Example 7, with 11 g. propargyl alcohol, 50 ml. ethyl acetate and 10 ml. of a HCl saturated benzene solution, 39 g. of an oil consisting substantially of propargyloxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid are thus obtained. The product has the formula:

. Analysis.-N percent found: 4.62 (calculated: 4.94). P percent found: 10.68 (calculated: 10.94).

Example 12 41 g. methylolamide of 0,0-diethyldithiophosphorylacetic acid are treated as described in Example 7, with 11 g. propargyl alcohol, 40 ml. ethyl acetate and. 10 ml. benzene saturated with HCl. The mixture yields 44 g. of an oil substantially consisting of propargyloxymethylenamide of 0,0-diethydithiophosphorylacetic acid of the formula:

Ifi-soIn-c o NHCII,O-OH -CECI-I 031160 Analysis.-P percent found: 9.46. P percent calculated: 9.95.

Example 13 37 g. methylolamide of 0,0-dimethyldithiophosphorylacetic acid are treated as described in Example 7, with 11.3 g. allyl alcohol, 50 ml. ethyl acetate and 10 ml. benzene saturated with HCl. The reaction mixture yields 38 g. of an oil consisting substantially of allyloxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid of the formula: 1

CHaO

P-S-CI-Iz-CONHCH O-CH;CH=CII1 Gino s Analysis.-N percent found: 4.76. percent calculated: 4.91.

' Example 14 41 g. methylolamide of 0,0-diethyldithiophosphorylacetic acid are treated according. to Example 7, with 11.3 g. allyl alcohol, 50 ml. ethylacetate and 10 ml. benzene saturated with HCl. The reaction mixture yields 43 g. of an oilconsisting substantially of allyloxymethylenamide of 0,0-diethyldithiophosphorylacetic acid of the formula:

P-soII,-cONII-om-O-om-clhcm olmo g Analysis.--N percent found: 4.23. N percent calculated: 4.47.

Example 15 41 g. methylolamide of 0,0-diethyldithiophosphorylacetic acid are treated as described in Example 7, with Analysis.-N percent found: 4.02. N percent calculated: 4.23.

Example 16 37 g. methylolamide of 0,011imethyldithiophosphorylacetic acid treated as described in Example 7, with 14.8 g. Z-methoxyethanol, 50 ml. ethyl-acetate and 10 ml. benzene saturated with HCl, yield 42 g. of an oil, consisting substantially of methoxyethoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid of the formula:

CHzO

P=SCH2-CONH-CHaO-CHz-OCH, C aO S Analysis.-P percent found: 10.11. P percent calculated: 10.22.

Example 17 41 g. methylolamide of 0,0-diethyldithiophosphorylacetic acid treated; as described in Example 7, with 18 g. Z-methylmercaptoethanol, 50 ml. ethyl-acetate and 10 ml. benzene saturated with HCl, yield 51 g. of an oil consisting subtantially of methylmercaptoethoxymethylamide of 0,0-diethyldithiophosphorylacetic acid of the formula:

Analysis.-N percent found: 3.67. N percent calculated: 4.03..

Example 18 Example I 9 38.8 g. N-methylolamide f the O-methyl,O-ethyldithiophosphorylacetic acid are treated with 50 ml. anhydrous methanol and subsequently with 3 ml. of a 10% methanol solution. The vessel is sealed and the mixture is heated at 45 C. for 6 hours, then it is stored for hours at room temperature. The mixture is evaporated under reduced pressure to a reduced volume and then the residue is treated with 50 ml. methylene chloride, washed with a saturated NaHCO solution and finally with 70 ml. water. MgSO, and having evaporated the solvent, a residue consisting of 37 g. of a lightly straw-colored oil having D =1.265 and n =l.53O0 is obtained. Said oil consists substantially of methoxymethylenamide of the O- methyl-O-ethyl-dithiophosphorylacetic acid having the for: mula:

N calculated=5.12%; N found=4.85-4.86%.

After having dried the mixture on anhydrous Example 20 38.8 g. N-methylolamide of the O-methyl-O-ethyl-dithiophosphorylacetic acid are treated with 50 ml. absolute ethanol and then with 3 ml. of a 10% HQ ethanol solution. By operating as described in Example 19, a residue consisting of 37 g. of a lightly straw-colored oil having D ==L230 and n =L5245 is obtained. Said oil consists essentially of the ethoxymethylenamide of the O- methyl-O-ethyl-dithiophosphorylacetic acid having the formula:

CH O

P calculated=l0.78; P found=10.6310.65%.

Example 21 38.8 g. N-methylolamide of the O-methyLO-ethyldithiophosphorylacetic acid are suspended in the 40 ml. ethylacetate, 9 g. isopropylalcohol, and 3 ml. of a 10% HCl isopropanol solution. The mixture is heated, under continuous stirring, for 6 hours at 45 C. and is then stored at room temperature for 15 hours. The mixture is washed with 30 ml. of a saturated NaHC0 solution and thereafter with 50 ml. water. After having dried on anhydrous MgSO, and evaporated the solvent under reduced pressure, a residue consisting of 38 g. of a slightly strawcolored oil having D =1.233 and n =L5253 is obtained. Said oil consists substantially of isopropoxyrnethylenamide of the O-methylO-ethyldithiophosphorylacetic acid having the formula:

Geno

N calculated=4.64%; N found=4.684.69%.

Example 22 38.8 g. N-methylolamide of the O-methyl,O-ethyl-dithiophosphorylacetic acid are suspended in 50 ml. ethyl acetate; 9 g. propylic alcohol and then 5 ml. of a 10% propanol solution are added. By operating as described in Example 21, 37 g. of a lightly straw-colored oil having D ==1.233 and n =1.5273 are obtained. Said oil consists of N-propoxymethylenamide of the O-methyLO- ethyl-dithiophosphorylacetic acid having the formula:

P calculated=10.28%; P found=10.63-10.64%.

Example 23 38.8 g. N-methylolamide of the O-methyl,O-ethyl-dithiophosphorylacetic acid are suspended in 50 ml. ethylacetate; 11 g. propargyl alcohol and 10 ml. benzene saturated in cold with gaseous HCl are then added. Said mixture is heated under frequent stirring for 6 hours at 45 C. and then stored for 15 hours at room temperature. The mixture is washed with a ml. of a 4% NaHCO solution, and subsequently with 50 ml. water. After having dried on MgSO (anhydrous) and evaporated under reduced pressure, 38 g. of a red colored oil having D =1.257 and n =1.5360 are obtained. Said oil consists essentially of propargyloxymethylenamide of the O-methyl,O-ethyl-dithiophosphorylacetic acid having the formula: 1 i 1 onto P calculated 10.41%; P found 10.46-10.64%.

Example 24 I 38.8 g. N-methylolamine of the O-methyl,O-ethyl-dithiophosphorylacetic acid are suspended into 50 ml. ethylacetate; 11.3 g. allyl alcohol and then ml. benzene saturated in cold gaseous HCl are added. By operating as described in Example 21, 35.5 g. of a lightly strawcolored oil having D =1.234 and n =L5387 are obtained. Said oil consists substantially of allyloxymethylenamide of the O-methy-l,O-ethyl-dithiophosphorylacetic acid, having the formula:

' orno fis-o Hz-C 0NHC m-oo II:-G H=C In CzHsO S P calculated 10.34%; P found 10.41-10.47%.

Example 38.8 g. N-methylolarnide of the O-methyl,O-ethyl-dithiophosphorylacetic acid are suspended into 50 ml. ethylacetate; 14.8 g. methoxyethyl alcohol and then 10 cc. benzene saturated in cold with gaseous H Cl are added. By operating as described in Example 21, 39 g. of a straw-colored oil having D l.234 and n 9=1.5231 are obtained. Said oil consists substantially of fi-methoxyethoxy-rnethylenamide of the O-methyLO-ethyldithiophosphorylacetic acid having the formula:

' /fi-SCHz-O0-NHOHz- 0CHz-CH, 0 1150 B P calculated 9.76%; P found 9.959 .99%.

7 Example 26 38.8 g. of N-methylolarnide of the O-methyl,O-ethyl-dithiophosphorylacetic acid are suspended into 50 ml. of ethyl acetate; 18 g. of p-methyl-mercaptoethanol and then 10 ml. benzene saturated in cold with gaseous HCl are added to the suspension. By operating as described in Example 21, 36 g. of a yellow -colored oil having D l.281 and n =L5529 are obtained. Said oil consists substantially of fl-methyl-mercaptoethoxymethylenamide of the O methyl O-ethyl-dithiophosphorylacetic acid having the formula:

P calculated 9.29%; P found 9.09%.

RESULTS OF THE EFFECTIVENESS OF THE PARASITICIDAL ACTIVITY OBTAINED IN LABORATORY TESTS To illustrate the insecticidal and-parasiticidal activity ofthe aforesaid compounds obtained in the preceding examples the following examples are reported:

Example 27.Activity against Musca domestica for topical application The doses to obtain a 50% mortality of the insects, by

using acetone solutions of the products obtained in Examples 1 to 18 in topical application tests, by means of a microsyringe on five-day old female flies, are the following:

Substance obtained in Example No.:

Example 28.Activity against Aphis fabae (contact) The concentrations necessary to produce a mortality by treating, under standardized conditions, with suitably formulated aqueous dispersions of the compounds to be tested, broad-bean plants infested by apterous parthenogenic females of A plzis fabae, which are bred under artificial light, are the following:

Substance obtained Conc., p.p.m.

in Example No.:

Example 29.--Activily against Tetranichus telarius To obtain a 95% mortality on a mixed population of T etranichas telarius, with mites of different growth stage, bred on bean plants under artificial light, but treating the plants under standardized conditions, with aqueous dispersions of the compounds considered, the following concentrations are necessary:

Example 30.-Activity against Aphis fabae, by systemic rootway To obtain a 95% mortality within 6 days on apertous, parthenogenic females of Aphis fabae, which are bred under artificial light, on broad-bean plants in which the root apparatus is dipped into an aqueous suspension to be tested and suitably formulated prod-uct, the following doses are necessary:

Example 31.Activily against Musca domestica (topical application) By topical application, by means of a microsyringe of an acetone solution of the compounds to be tested, on fiveday old female flies, the following average percentage mortalities listed in Table I, below, wereobtained at the 20th hour; in said table are suggested also the doses necessary to obtain a 50% mortality of the insects.

TABLE I.-ACTIVITY AGAINST FLY (MUSCA DOMESTIOA) BY TOPICAL APPLICATION Percent Product Dose mortality LD 'y/musca at; the 7/11};

20th hour Methoxy-mcthyienamide oi the 0. 300 100 O-methyl,O-ethyl-dithiophos- 0. 225 92 0. 15 phorylacctic acid. 0. 168 68 0. 126 20 Ethoxy-meth lenamide oi the 0.66 100 O-mcthyl, -ethy1-dithio- 0. 45 81 0.35 phosphorylacetic acid. 0. 34 48 0. 25 11 Iso ro oxy-methylenamide of 0. 667 100 tiie i-rnethyLO-ethyl-dithio- 0. 500 93 0. 35 phosphorylacetic acid. 0. 375 58 0.281 19 N -propoxymethylenamide of 0. 800 100 the O-rnethy1,0-ethyl-dithio- 0. 600 90 0. 4 phosphorylacetie acid. 0. 450 64 0. 337 31 Pro ar loxymethylenamide of 0. 600 100 thg O inethyLO-ethyl-dithio- 0. 450 89 0.328 phosphorylacetic acid. 0. 340 63 0. 250 17 Allyloxymethylenamide oi the 0.888 100 O-metlhyl,)-ethgl-dithiophos- 39 hot acet e aci p y 0.375 50 0.281 13 -Metho ethoxy-methylcnamide 1.000 100 B of the O -methyI, Octhyl- 0.800 98 dlthiophosphorylacetie acid. 0. 600 88 0. 43

fi-Methyl-mercaptocthoxy- 1. 2 100 znethylcnamide oi the 0.8 90 O-methyl, Octhyl-dlthlo- 0. 6 76 4. 15 phosphorylacetic acid. 0. 45 49 0. 337 27 Exarnple 32.--Activity against Aphis fabae By dipping a population of apterous, parthenogenic female adhips on broad bean plants, under standardized conditions into an aqueous dispersion of the suitabh formulated compounds to be tested, the average percent age mortalities listed in Table II at the 24th hour were obtained. In said table also the doses necessary to obtain a mortality of the insects are shown (a.s.=active substance).

TABLE II.-ACTIVITY ON APHIDS (APHIS FABAE) B1 DIIPING Dose, Percent LI) Product p.p.m. mortality p.p.m.,

oi as. at: the 24th h. oia.s.

6.0 Methoxymethylenomidc oi the 2. 50 95 O-methyl, O-cthyldithiophosl. 25 69 phorylawtic acid. 0.62 28 2. t

Ethoxymethylnmide oi the 5. 00 100 O-methyl, O-ethyldithiophos- 2.50 95 2 E phorylacetic acid. 1. 25 62 0. 62 18 Isopropoxymothylenarnide oi the 10.00 100 O-methyl, O-ethyldithiophos- 5.00 90 6 1 phorylecetic acid. 2. 50 49 1. 25 10 N-propoxymethylennmide of the 10. 00 100 O-methyl, O-ethyldithiophos- 5. O0 98 4. 2 phorylaeetic acid. 2. 50 72 1. 25 24 Propargyloxymethylenamide of 10.00 100 the O-methyl, O-ethyldithio- 5. 00 99 5 phosphorylacetic acid. 2. 50 65 l. 25 15 Allyloxymcthylennmide of the 10.00 100 O-methyi, O-ethyldithiophos- 5.00 90 phorylecctic acid. 2. 50 90 3. 3

fl-methoxyethoxymethylenamide 20. 00 100 of the O-methyl, O-ethyldi- 10. 00 99 thiophosphorylacetie acid. 5.00 93 6 fl-methylmercaptoethoxymeth- 100 ylenamide of the 0-rnetl1yl, 62 92 72 O-ethyldithiophosphoryl- 31 55 acetic acid. 16 20 Example 33.Activity against Aphis fabae by systemic rootway The hypogeurn portion of young broad-bean plants infested by Aphis fabae is introduced into small pots of colored glass containing aqueous dispersions of the product to be tested. The pots are kept in a suitable place for the insects during a period of 7 days. The mortality of aphids living on the epygeurn portion of the plant is inspected daily and the final inspection is made on'the 7th day. In Table III are shown the average percentage mortalities and the doses necessary to obtain a 95 mortality.

TABLE TIL-ACTIVITY AGAINST APIIIS FAB/1E BY SYS- TEMIC ROOTWAY Dose Percent LI) Product p.p.m. mortality ppm.

of as. on the 7th oi as. day

N-propoxymethylenamide of 0. 500 100 the O-methyl, Octhyldithio' 0. 250 70 0. 46 phosphorylacetic acid. 0.125 O. 062 22 Propargyloxymethylcnarnide of 1. 25 100 the O-methyl, O-ethyldithio- 0. 26 98 phosphorylacetic acid. 0.31 89 0. 43

Allyloxymethylenaniide of the 0.62 100 O-methyl, Oethyldithiophos- 0. 31 90 phorylacctic acid. O. 16 49 0. 38 0.08 15 B-methoxy-ethoxy-methylcn- 1. 000 100 amide of the O-mcthyl, 0- 0.500 98 ethyldlthiophosphorylacetic' 0. 250 86 0. acid. 0. 125 40 fl-metliylmercnptocthoxymcth- 2. 00 100 ylenamlde of the O-methyl, 1.00 83 O-ethyldithiophosphoryl- 0.50 40 1. 5 acetic acid. 0.25 23 Example 34.-Activity against Tetranychus telarius TABLE IV.ACTIVITY AGAINST ACARUS (TETRANYCHUS TELARIUS) BY DIPPING Dose, Percent LDM Product \p.p.m. mortality p.11 .m. of as. at the 24th of as. hour Mcthoxymethylenamidc of the 2. 100

O-mcthyl, O-ethyldithlophos- 1. 25 84 1. 7 'phorylacetic acid. 0. 62 42 0.31 4

Ethoxy-rnethylenamido ol the 5.0 100 O-mcthjrl, O-ethyldithiophos- 2. 6 93 2. 7 phorylacetlc acid. 1. 26 23 I Ice ropoxymethylcmnnide of 10.00 100 v t 10 O-mcthyl, O-ethyldlthlo- 5.00 92 6 phosphorylacetic acid. 2. 50 65 1. 25 13 N -propoxyn1ethylenamidc of 10. 00 100 the O-mcthyl, O-ethyldlthio- 5.00 99 3. 8 phosphorylneetic acid. 2. 60 1. 25 14 Propargyloxymethylenamlde of 10.00 100 the O-methyl, O-ethyldlthio- 5. 00 94 5 phosphorylaeetic acid. 2. 60 75 I 1. 25 25 Allyloxymethylenamido of the 20.00 100 O-mcthyl, O-ethyldithiophos- 10. 00 9B phorylacetlc acid. 5. 00 8B 7 fl-methoxyethoxy-methylen- 20.00 100 amide. of the O-methyl, 0- 10.00 99 othyldithiophosphorylacetlc 5. 00 7 acid. 2. 50 47 1. 25 14 fl-methylmercaprocthoxy-meth- 500 100 ylenamide o! the O-methyl, 250 98 O-ethyldithiophosphorylacctic 87 acid. I 62 54 31 17 We claim: 1. Phosphoric esters of the general formula P-S--C Hz-C O N R"O CHzO Rt in which R and R" are lower alkyl, X is taken from the group consisting of oxygen and sulfur, R is taken from the group consisting of lower alkyl, allyl, propargy'l, chloro lower alkyl, lower alkoxy lower alkyl and lower alkylmercapto lower alkyl.

2. Phosphoric esters of claim 1, in which R and R" are methyl.

3. Phosphoric esters of claim 1, in which R and R" are ethyl.

4. Phosphoric esters of claim 1, in which R is methyl and R is ethyl.

5. Phosphoric esters of claim 1, which R is selected from the group consisting of an alkyl containing one to five carbon atoms, chloroloweralkyl, alkoxyloweralkyl and methylrnercaptoloweralkyl group.

6. A compound of the formula:

I in which R and R are lower alkyl, R is a member of the group consisting of lower alkyl and lower alkoxy-lower alkyl, and X is a member of the group consisting of oxygen and sulfur.

7. Methoxymethylenamide of 0,0-dimethyldithiophosphorylacetic acid.

8. Methoxyrnethylenamide of 0,0-dielhylthiophosphorylacetic acid of the formula:

9. Methoxy methylenarnide of 0,0-diethyldithiophosphorylacetic acid.

10. Ethoxymethylenamide o-f 0,0dimethyldithiophosphorylacetic acid.

11. Propoxyrnethylenamide 01f 0,0-dimethyldithiophos-- phorylacetic acid.

12. Proipoxy-methy'lenarnide of 0,0-diethyldithiophosphorylacetic acid.

13. Isopropoxymethylenamide of 0,0-diethylthiophosphorylacetic acid of the formula:

No references cited.

CHARLES B. PARKER, Primary Examiner.

LESLIE H. GASTON, MORRIS LIEBMAN, IRVING MARCUS, Examiners.

FRANK M. SIKOR-A, JOSEPH P. BRUST,

Assistant Examiners. 

1. PHOSPHORIC ESTERS OF THE GENERAL FORMULA 